So, what makes this future sustainable wonderland so special? For starters, it has both everything and nothing that you'd expect from a tropical island.

With its old country charm, rugged terrain, empty beaches and forests of towering pine trees, the little island of Lanai feels like someone plopped a quaint Colorado village down in the middle of the Pacific.

A Rugged & Secluded Paradise

You won't find hordes of selfie stick-wielding tourists on Lanai. The Pineapple Island -- which was once home to the world's largest pineapple plantation -- boasts a number of secluded beaches, hikes and viewpoints that require a 4-wheel drive just to get to.

Lanai only has three hotel options: One quaint historical cottage and two Four Season resorts. One night in Hotel Lanai -- the smaller and cheaper of the options -- and you'll feel like you stepped back in time to old Hawaii.

The two Four Seasons Resorts offer decidedly different personalities of the island. The Lanai at Manele Bay is the island's beachside resort that fronts a marine preserve. The second Four Seasons resort, The Lodge At Koele, sits upland on 20 acres of rolling hills, gardens and pines trees, where deer roam the woods and you'll need a wool blanket to stay warm at night. It feels like a very different Hawaii.